Mass Transfer
Relative volatility varies with the concentration of component for an ideal solution. The relative volatity of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when

Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law
Only liquid phase obeys Dalton's law
Liquid phase obeys Dalton's law and vapor phase obeys Raoult's law
Only vapor phase follows Raoult's law

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Mass Transfer
Priming in a distillation column

Is desirable from point efficiency consideration
Reduces the overall pressure drop
Is characterised by the presence of foam throughout the space between trays
Results from very low gas velocity

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